Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Converts chemical energy to electrical

Converts chemical energy to electrical through a zinc-copper-sulfate redox couple

Eight aluminum-shank tuning forks tuned to scientific pitch (C4 = 256Hz) and ranging from 5 9/16 to 7 1/8 inches

the larger geometry pushing pole separation wide enough that field lines extend visibly beyond the magnet body for filing maps

75-inch diameter pendulum bob with a removable threaded hook

Spare 500g Iron Hooked Weight with Retractable Hook Subject_Astronomy Converts chemical energy to electricalCast iron 500g mass carries a retractable hook for suspension from spring scales, pulleys, or beams, serving as a replacement piece for gravitational and force measurement setups.